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233 lines
8.1 KiB
EmacsLisp
233 lines
8.1 KiB
EmacsLisp
;;; which-func.el --- Print current function in mode line
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;; Copyright (C) 1994, 1997, 1998 Free Software Foundation, Inc.
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;; Author: Alex Rezinsky <alexr@msil.sps.mot.com>
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;; Keywords: mode-line, imenu, tools
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package prints name of function where your current point is
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;; located in mode line. It assumes that you work with imenu package
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;; and imenu--index-alist is up to date.
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;; KNOWN BUGS
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;; ----------
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;; Really this package shows not "function where the current point is
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;; located now", but "nearest function which defined above the current
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;; point". So if your current point is located after end of function
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;; FOO but before begin of function BAR, FOO will be displayed in mode
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;; line.
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;; TODO LIST
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;; ---------
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;; 1. Dependence on imenu package should be removed. Separate
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;; function determination mechanism should be used to determine the end
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;; of a function as well as the beginning of a function.
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;; 2. This package should be realized with the help of overlay
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;; properties instead of imenu--index-alist variable.
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;;; History:
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;; THANKS TO
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;; ---------
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;; Per Abrahamsen <abraham@iesd.auc.dk>
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;; Some ideas (inserting in mode-line, using of post-command hook
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;; and toggling this mode) have been borrowed from his package
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;; column.el
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;; Peter Eisenhauer <pipe@fzi.de>
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;; Bug fixing in case nested indexes.
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;; Terry Tateyama <ttt@ursa0.cs.utah.edu>
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;; Suggestion to use find-file-hooks for first imenu
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;; index building.
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;;; Code:
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;; Variables for customization
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;; ---------------------------
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;;
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(defvar which-func-unknown "???"
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"String to display in the mode line when current function is unknown.")
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(defgroup which-func nil
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"Mode to display the current function name in the modeline."
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:group 'tools
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:version "20.3")
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(defcustom which-func-modes
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'(emacs-lisp-mode c-mode c++-mode perl-mode makefile-mode sh-mode
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fortran-mode)
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"List of major modes for which Which Function mode should be used.
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For other modes it is disabled. If this is equal to t,
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then Which Function mode is enabled in any major mode that supports it."
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:group 'which-func
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:type '(choice (const :tag "All modes" t)
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(repeat (symbol :tag "Major mode"))))
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(defcustom which-func-non-auto-modes nil
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"List of major modes where Which Function mode is inactive till Imenu is used.
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This means that Which Function mode won't really do anything
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until you use Imenu, in these modes. Note that files
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larger than `which-func-maxout' behave in this way too;
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Which Function mode doesn't do anything until you use Imenu."
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:group 'which-func
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:type '(repeat (symbol :tag "Major mode")))
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(defcustom which-func-maxout 100000
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"Don't automatically compute the Imenu menu if buffer is this big or bigger.
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Zero means compute the Imenu menu regardless of size."
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:group 'which-func
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:type 'integer)
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(defcustom which-func-format '(" [" which-func-current "]")
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"Format for displaying the function in the mode line."
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:group 'which-func
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:type 'sexp)
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;;;###autoload
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(defcustom which-func-mode-global nil
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"*Toggle `which-func-mode' globally.
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Setting this variable directly does not take effect;
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use either \\[customize] or the function `which-func-mode'."
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:set #'(lambda (symbol value)
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(which-func-mode (if value 1 0)))
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:initialize 'custom-initialize-default
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:type 'boolean
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:group 'which-func
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:require 'which-func)
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(defvar which-func-cleanup-function nil
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"Function to transform a string before displaying it in the mode line.
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The function is called with one argument, the string to display.
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Its return value is displayed in the modeline.
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If nil, no function is called. The default value is nil.
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This feature can be useful if Imenu is set up to make more
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detailed entries (e.g., containing the argument list of a function),
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and you want to simplify them for the mode line
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\(e.g., removing the parameter list to just have the function name.)")
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;;; Code, nothing to customize below here
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;;; -------------------------------------
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;;;
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(require 'imenu)
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(defvar which-func-current which-func-unknown)
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(defvar which-func-previous which-func-unknown)
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(make-variable-buffer-local 'which-func-current)
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(make-variable-buffer-local 'which-func-previous)
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(defvar which-func-mode nil
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"Non-nil means display current function name in mode line.
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This makes a difference only if `which-func-mode-global' is non-nil")
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(make-variable-buffer-local 'which-func-mode)
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(put 'which-func-mode 'permanent-local t)
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(add-hook 'find-file-hooks 'which-func-ff-hook t)
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(defun which-func-ff-hook ()
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"File find hook for Which Function mode.
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It creates the Imenu index for the buffer, if necessary."
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(if (or (eq which-func-modes t) (member major-mode which-func-modes))
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(setq which-func-mode which-func-mode-global)
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(setq which-func-mode nil))
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(condition-case nil
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(if (and which-func-mode
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(not (member major-mode which-func-non-auto-modes))
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(or (< buffer-saved-size which-func-maxout)
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(= which-func-maxout 0)))
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(setq imenu--index-alist
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(save-excursion (funcall imenu-create-index-function))))
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(error
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(setq which-func-mode nil))))
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(defun which-func-update ()
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;; Update the string containing the current function.
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(condition-case info
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(progn
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(if (not (setq which-func-current (which-function)))
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(setq which-func-current which-func-unknown))
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(if (not (string= which-func-current which-func-previous))
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(progn
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(force-mode-line-update)
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(setq which-func-previous which-func-current))))
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(error
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(ding)
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(remove-hook 'post-command-hook 'which-func-update)
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(which-func-mode -1) ; Function mode off
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(message "Error in which-func-update: %s" info))))
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;; This is the name people would normally expect.
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;;;###autoload
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(defalias 'which-function-mode 'which-func-mode)
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;;;###autoload
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(defun which-func-mode (&optional arg)
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"Toggle Which Function mode, globally.
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When Which Function mode is enabled, the current function name is
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continuously displayed in the mode line, in certain major modes.
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With prefix arg, turn Which Function mode on iff arg is positive,
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and off otherwise."
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(interactive "P")
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(if (or (and (null arg) which-func-mode-global)
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(<= (prefix-numeric-value arg) 0))
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;; Turn it off
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(if which-func-mode-global
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(progn
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(remove-hook 'post-command-hook 'which-func-update)
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(setq which-func-mode-global nil)
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(setq which-func-mode nil)
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(force-mode-line-update)))
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;;Turn it on
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(if which-func-mode-global
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()
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(add-hook 'post-command-hook 'which-func-update)
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(setq which-func-mode-global t)
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(setq which-func-mode
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(or (eq which-func-modes t)
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(member major-mode which-func-modes))))))
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(defun which-function ()
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"Return current function name based on point.
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If `imenu--index-alist' does not exist, or is empty or if point
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is located before first function, returns nil."
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(and
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(boundp 'imenu--index-alist)
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imenu--index-alist
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(let ((pair (car-safe imenu--index-alist))
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(rest (cdr-safe imenu--index-alist))
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(name nil))
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(while (and (or rest pair)
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(or (not (number-or-marker-p (cdr pair)))
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(> (point) (cdr pair))))
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(setq name (car pair))
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(setq pair (car-safe rest))
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(setq rest (cdr-safe rest)))
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(and name
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(if which-func-cleanup-function
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(funcall which-func-cleanup-function name)
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name)))))
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(provide 'which-func)
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;; which-func.el ends here
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